sidereal day

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The time it takes for the Earth to complete one rotation on its axis such that a particular point on the surface returns to its former position in relation to the position of the fixed stars. The sidereal day, of 23 hours 56 minutes and 3.93 seconds, is 3 minutes 50 seconds shorter than the mean solar day, because the movement of the Earth in its solar orbit is imposed on its rotational motion.

Subjects: Meteorology and Climatology.

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